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PDF GS2994 Datasheet ( Hoja de datos )

Número de pieza GS2994
Descripción Adaptive Cable Equalizer
Fabricantes Semtech 
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GS2994 datasheet

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GS2994 pdf
Table 1-1: GS2994 Pin Descriptions (Continued)
Pin Number
8
Name
SQ_ADJ
Timing
Analog
Type
Input
9
OP_CTL
Not
Input
Synchronous
10, 11
12
13
SDO, SDO
VEE_O
VCC_O
Analog
Analog
Analog
Output
Power
Power
14 SLEEP Not Input
Synchronous
15 CD Not Output
Synchronous
16
VCC_A
Analog
Power
Center Pad
Power
Description
Squelch Threshold Adjust.
Adjusts the input signal amplitude threshold of the carrier detect
function. The output can be muted when the input signal
amplitude is too low by connecting the CD and OP_CTL pins
together through some external components. In this case, when CD
is LOW (0V), OP_CTL is forced LOW (0V), and when CD is HIGH
(2.5V), OP_CTL is forced HIGH (3.3V). The input level at which the
part is muted can be set through the SQ_ADJ pin through suitable
voltage variances as described in Section 4.4. NOTE: when the
SQ_ADJ functionality is used and/or in auto_mute, the auto sleep
feature is not allowed, and the SLEEP pin should be left open.
Includes an internal pull-down resistor.
CONTROL SIGNAL INPUT
Controls the Output Swing, De-emphasis, and Mute features of the
SDO and SDO outputs.
When connected to GND, the output swing is 800mV with no
de-emphasis. When connected to the 3.3V analog power supply, the
output is MUTED.
Includes an internal pull down resistor.
See Section 4.7 for all other control options.
Equalized serial digital differential output.
Most negative power supply for the output buffer.
Connect to GND.
Most positive power supply connection for the output buffer of the
device.
Connect to +1.2V ~ +3.3V DC.
CONTROL SIGNAL INPUT
When set HIGH, the GS2994 is powered-down except for the Carrier
Detect functionality.
Includes an internal pull-down resistor.
Carrier Detect status signal output.
Signal levels are LVCMOS/LVTTL compatible.
Indicates the presence of an input signal. When the CD pin is LOW, a
good input signal has been detected. When this pin is HIGH, the
input signal is invalid.
See Section 4.5.
Most positive power supply for the input buffer, core and control
circuits of the device.
Connect to +3.3V DC.
Internally bonded to VEE_A.
GS2994 GS2994 Adaptive Cable Equalizer
Data Sheet
53967 - 4
August 2012
5 of 20

5 Page

GS2994 arduino
4. Detailed Description
The GS2994 is a high-speed BiCMOS IC designed to equalize serial digital signals.
The GS2994 can equalize 3Gb/s, HD and SD serial digital signals, and will typically
equalize 140m of Belden 1694A cable at 2.97Gb/s, 220m at 1.485Gb/s and 400m at
270Mb/s. The GS2994 can be powered from a single +3.3V power supply, and is
footprint compatible with the GS2974 and GS2984 equalizers. When using 1.2V CML,
the GS2994 typically consumes approximately 167mW of power.
4.1 Serial Data Inputs
The Serial Data signal can be connected to the input pins (SDI/SDI) in either a differential
or single-ended configuration. AC-coupling of the inputs is recommended, as the SDI
and SDI inputs are internally biased at approximately 1.8V.
4.2 Cable Equalization
The input signal passes through a variable gain equalizing stage, whose frequency
response closely matches the inverse of the cable loss characteristic. In addition, the
variation of the frequency response with control voltage imitates the variation of the
inverse cable loss characteristic with cable length.
The edge energy of the equalized signal is monitored by a detector circuit which
produces an error signal corresponding to the difference between the desired edge
energy and the actual edge energy. This error signal is integrated by both an internal and
an external AGC filter capacitor providing a steady control voltage for the gain stage. As
the frequency response of the gain stage is automatically varied by the application of
negative feedback, the edge energy of the equalized signal is kept at a constant level
which is representative of the original edge energy at the transmitter. The equalized
signal is also DC-restored, effectively restoring the logic threshold of the equalized
signal to its correct level independent of shifts due to AC-coupling.
GS2994 GS2994 Adaptive Cable Equalizer
Data Sheet
53967 - 4
August 2012
11 of 20

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